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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Magnesium isotope systematics in Martian meteorites
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Magnesium isotope systematics in Martian meteorites

机译：Martian Meteorites的镁同位素系统

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摘要

Magnesium isotope compositions are reported for a suite of Martian meteorites that span the range of petrological and geochemical types recognized to date for Mars, including crustal breccia Northwest Africa (NWA) 7034. The delta Mg-26 values (per mil units relative to DSM-3 reference material) range from -0.32 to -0.11 parts per thousand; basaltic shergottites and nakhlites lie to the heavier end of the Mg isotope range whereas olivine-phyric, olivine-orthopyroxene-phyric and lherzolitic shergottites, and chassignites have slightly lighter Mg isotope compositions, attesting to modest correlation of Mg isotopes and petrology of the samples. Slightly heavier Mg isotope compositions found for surface-related materials (NWA 7034, black glass fraction of the Tissint shergottite fall; delta Mg-26 > -0.17 parts per thousand) indicate measurable Mg isotope difference between the Martian mantle and crust but the true extent of Mg isotope fractionation for Martian surface materials remains unconstrained. The range of delta Mg-26 values from -0.19 to -0.11 parts per thousand in nakhlites is most likely due to accumulation of clinopyroxene during petrogenesis rather than garnet fractionation in the source or assimilation of surface material modified at low temperatures. The rather restricted range in Mg isotope compositions between spatially and temporally distinct mantle-derived samples supports the idea of inefficient/absent major tectonic cycles on Mars, which would include plate tectonics and large-scale recycling of isotopically fractionated surface materials back into the Martian mantle. The cumulative delta Mg-26 value of Martian samples, which are not influenced by late-stage alteration processes and/or crust-mantle interactions, is -0.271 +/- 0.040 parts per thousand (2SD) and is considered to reflect delta Mg-26 value of the Bulk Silicate Mars. This value is robust taking into account the range of lithologies involved in this estimate. It also attests to the lack of the Mg isotope variability reported for the inner Solar System bodies at current analytical precision, also noted for several other major elements. (C) 2017 Elsevier B.V. All rights reserved.
机译：据报道镁同位素组合物为跨越迄今为止迄今为止的岩石和地球化学类型的套房，包括地壳Breccia西北非洲（NWA）7034。ΔMG-26值（相对于DSM的每个MIL单位） 3参考资料）范围从-0.32至-0.11份‰;玄武岩Shercottes和Nakhlites位于Mg同位素范围的较重结束，而橄榄石 - 凤梨苷，橄榄石 - 卵戊酮 - 凤腺和甲状腺样品术，乳糜序列具有略微较轻的Mg同位素组合物，证明了Mg同位素和样品的岩石学的适度相关性。稍微重较重的Mg同位素组合物，用于表面相关材料（NWA 7034，混合Shergottites秋季的黑色玻璃分数;δmg-26> -0.17份份数）表明Martian Mantle和地壳之间的可测量Mg同位素差异，但是真实程度Mg IsoTope Forian表面材料的分馏仍然无约束。从-0.19至-0.11份达克莱斯中达到-0.11份的Delta Mg-26值的范围很可能是由于在低温下修饰的表面材料的源源或同化的石油发生而不是石榴石分馏，最有可能是由于肝脏的积累。在空间和时间上不同的搭桥衍生的样品之间的Mg同位素组合物中的相当受限制的范围支持火星上的低效/不存在的主要构造周期的概念，这将包括板块构造和大规模回收同位素分级的表面材料回到火星地幔中。 Martian样品的累积Delta Mg-26值，不受晚期改变过程和/或外壳搭腔相互作用的影响 - 0.271 +/- 0.040份（2SD），被认为反映Delta Mg- 26散装硅酸盐火星的值。考虑到此估计中涉及的岩性范围，该值是强大的。它还证明了在当前分析精度下为内阳系统主体报告的Mg同位素可变性，也注明了几个其他主要元素。 （c）2017年Elsevier B.V.保留所有权利。

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